{"record":{"id":"03b033ed899178ef","repo":"stride3d/stride","slug":"failed-to-register-a-mouse-device-for-raw-input","errorCode":null,"errorMessage":"Failed to register a mouse device for raw input","messagePattern":"Failed to register a mouse device for raw input","errorType":"exception","errorClass":"Exception","httpStatus":null,"severity":"error","filePath":"sources/engine/Stride.Input/Windows/RawInput/RawInputMouse.cs","lineNumber":33,"sourceCode":"        private readonly IntPtr targetWindow;\n\n        public event EventHandler<RawInputMouseEventArgs> events;\n\n        private readonly RawInputMessageFilter messageFilter;\n        private bool disposedValue;\n\n        public RawInputMouse(IntPtr targetWindow)\n        {\n            this.targetWindow = targetWindow;\n            this.messageFilter = new RawInputMessageFilter(this.HandleInputMessage, null, null);\n        }\n\n        public void Start()\n        {\n            var result = RawInput.RegisterDevice(UsagePage.HID_USAGE_PAGE_GENERIC, UsageId.HID_USAGE_GENERIC_MOUSE, ModeFlags.RIDEV_INPUTSINK, targetWindow);\n            if (!result)\n            {\n                throw new Exception(\"Failed to register a mouse device for raw input\");\n            }\n\n            Application.AddMessageFilter(messageFilter);\n        }\n\n        public void End()\n        {\n            Application.RemoveMessageFilter(messageFilter);\n\n            var result = RawInput.RegisterDevice(UsagePage.HID_USAGE_PAGE_GENERIC, UsageId.HID_USAGE_GENERIC_MOUSE, ModeFlags.RIDEV_REMOVE, IntPtr.Zero);\n            if (!result)\n            {\n                throw new Exception(\"Failed to unregister a mouse device for raw input\");\n            }\n        }\n\n        public void HandleInputMessage(RawInput.RawMouse mouseInput)\n        {","sourceCodeStart":15,"sourceCodeEnd":51,"githubUrl":"https://github.com/stride3d/stride/blob/96fad776d210c221682aac1ccdf4c79dc046fc38/sources/engine/Stride.Input/Windows/RawInput/RawInputMouse.cs#L15-L51","documentation":"RawInputMouse.Start registers the HID mouse device with the Windows Raw Input API via RawInput.RegisterDevice using RIDEV_INPUTSINK so mouse input is delivered to the target window's message filter. If the underlying RegisterRawInputDevices Win32 call fails, the library throws this exception, aborting mouse initialization.","triggerScenarios":"Calling Start() when RegisterRawInputDevices fails — e.g. targetWindow handle is invalid/zero, the window was already destroyed, RIDEV_INPUTSINK target rules are violated, or the system rejects the device registration.","commonSituations":"Game window not yet created or disposed before Start; passing an IntPtr.Zero target window with RIDEV_INPUTSINK; running in restricted desktop sessions (RDP, service accounts, elevated/un-elevated UIPI mismatches).","solutions":["Ensure the target window is created and its handle is valid (non-IntPtr.Zero) before calling Start().","Verify the window handle belongs to the calling thread's process and the window is not already destroyed.","Check for UIPI/elevation mismatch between the process and the foreground window and run at a consistent privilege level.","Retry registration after the window handle changes (e.g. after recreating the window/device)."],"exampleFix":"// before\nmouse.Start(); // targetWindow not yet created\n// after\nwindow.Create();\nmouse.Start(); // now targetWindow is a valid HWND","handlingStrategy":"try-catch","validationCode":"if (targetWindow == IntPtr.Zero) throw new InvalidOperationException(\"Start raw input only after the window handle is created\");","typeGuard":"bool CanStart(RawInputMouse m) => m != null && targetWindow != IntPtr.Zero;","tryCatchPattern":"try { mouse.Start(); } catch (Exception ex) when (ex.Message.Contains(\"Failed to register a mouse device\")) { Log.Error(ex); /* fall back to non-raw input or recreate window */ }","preventionTips":["Create the window and obtain a valid HWND before initializing input","Dispose input before the window handle is destroyed","Avoid mixing elevated/un-elevated processes that trigger UIPI failures","Log the Win32 error code from RegisterRawInputDevices failures"],"tags":["raw-input","windows","input-device-registration","win32"],"backgroundTag":"module-init-failed","analyzedSha":"96fad776d210c221682aac1ccdf4c79dc046fc38","analyzedAt":"2026-09-14T02:59:31.279Z","contentChangedAt":"2026-09-14T02:59:31.279Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}